QImage (..) & QImage::save() always return NULL value - why?

Hi, I'm having the following problem:

I'm creating an object

Code:

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QImage image ( 10,10,32 );

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And tring to save it

Code:

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image.save("smth.jpg","JPG");

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image.save returns NULL - why?

Save function works for images being loaded and doesn't for those I create myself
My operating system is winXP, QT ver 3.3.3, VS.NET 2003...

Sorry if this question is too simple to be posted... still I cant find a solution. :confused:
Thanks a lot for your time.
GREG.

Did you try "JPEG" instead of "JPG"? Was your Qt built with JPEG support? What does QImageIO::outputFormats() return?

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Did you try "JPEG" instead of "JPG"?

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Tried to - no difference...

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Was your Qt built with JPEG support?

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Yes, sure - Loaded images are saved without any troubles.

Quote:

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What does QImageIO :: outputFormats() return?

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Never tried it... I will tomorrow - Don't have a QT installed here to try your advises. If you have a working example consisting of creation and saving an QImage object , pls, post it here. :o

Thanks a lot for your help!

Vladimir Ostapenko has told me a solution, so I'm posting a working code:

Code:

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QImage image(20,20,32);
QString str = "t.jpg";
image.save(str,"JPEG");

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Anybody knows , why QString is necessary ?